FM1808-120-P ETC [List of Unclassifed Manufacturers], FM1808-120-P Datasheet

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FM1808-120-P

Manufacturer Part Number
FM1808-120-P
Description
256Kb Bytewide FRAM Memory
Manufacturer
ETC [List of Unclassifed Manufacturers]
Datasheet
Preliminary
FM1808
256Kb Bytewide FRAM Memory
Features
256K bit Ferroelectric Nonvolatile RAM
Superior to BBSRAM Modules
Description
The FM1808 is a 256-kilobit nonvolatile memory
employing an advanced ferroelectric process. A
ferroelectric random access memory or FRAM is
nonvolatile but operates in other respects as a RAM.
It provides data retention for 10 years while
eliminating
disadvantages and system design complexities of
battery-backed SRAM. It’s fast write and high write
endurance makes it superior to other types of
nonvolatile memory.
In-system operation of the FM1808 is very similar to
other RAM based devices. Memory read- and write-
cycles require equal times. The FRAM memory,
however, is nonvolatile due to its unique ferroelectric
memory process. Unlike BBSRAM, the FM1808 is a
truly monolithic nonvolatile memory. It provides the
same functional benefits of a fast write without the
serious disadvantages associated with modules and
batteries or hybrid memory solutions.
These capabilities make the FM1808 ideal for
nonvolatile memory applications requiring frequent or
rapid writes in a bytewide environment. The
availability of a true surface-mount package improves
the manufacturability of new designs, while the DIP
package facilitates simple design retrofits. The
FM1808 offers guaranteed operation over an
industrial temperature range of -40°C to +85°C.
This data sheet contains design specifications for product development.
These specifications may change in any manner without notice.
27 July 2000
Organized as 32,768 x 8 bits
High endurance 10 Billion (10
10 year data retention at 85 C
NoDelay™ write
Advanced high-reliability ferroelectric process
No battery concerns
Monolithic reliability
True surface mount solution, no rework steps
Superior for moisture, shock, and vibration
Resistant to negative voltage undershoots
the
reliability
concerns,
10
) read/writes
functional
SRAM & EEPROM Compatible
Low Power Operation
Industry Standard Configuration
FM1808-70-P
FM1808-70-S
FM1808-120-P
FM1808-120-S
Pin Configuration
JEDEC 32Kx8 SRAM & EEPROM pinout
70 ns access time
130 ns cycle time
Equal access & cycle time for reads and writes
25 mA active current
20 A standby current
Industrial temperature -40 C to +85 C
28-pin SOP or DIP
(800) 545-FRAM, (719) 481-7000, Fax (719) 481-7058
DQ0
DQ1
DQ2
VSS
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
1850 Ramtron Drive, Colorado Springs, CO 80921
Ordering Information
70 ns access, 28-pin plastic DIP
70 ns access, 28-pin SOP
120 ns access, 28-pin plastic DIP
120 ns access, 28-pin SOP
Ramtron International Corporation
www.ramtron.com
VDD
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
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FM1808-120-P Summary of contents

Page 1

... A14 A12 A7 functional DQ0 DQ1 DQ2 VSS Ordering Information FM1808-70-P FM1808-70-S FM1808-120-P FM1808-120-S 1850 Ramtron Drive, Colorado Springs, CO 80921 (800) 545-FRAM, (719) 481-7000, Fax (719) 481-7058 VDD WE A13 A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3 70 ns access, 28-pin plastic DIP ...

Page 2

... Address changes that occur after /CE goes low will be ignored until the next falling edge occurs. Output Enable. When /OE is low the FM1808 drives the data bus when valid data is available. Taking /OE high causes the DQ pins to be tri- stated. ...

Page 3

... When /OE is inactive the data bus will remain tri-stated. Write Operation Writes occur in the FM1808 in the same time interval as reads. The FM1808 supports both /CE and /WE controlled write cycles. In all cases, the address is latched on the falling edge of /CE. ...

Page 4

... To balance the endurance cycles and allow the user the maximum 27 July 2000 flexibility, the FM1808 employs a unique memory organization as described below. The memory array is divided into 32 blocks, each 1Kx8. The 5 -upper address lines decode the block selection as shown in Figure 2 ...

Page 5

... FDh 00h FCh Applications As the first truly nonvolatile RAM, the FM1808 fits into many diverse applications. Clearly, its monolithic nature and high performance make it superior to battery-backed SRAM in most every application. This applications guide is intended to facilitate the transition from BBSRAM to FRAM divided into two parts ...

Page 6

... Systems that drive chip enable active, then inactive for each valid address may need no modifications. An example of the target signal relationships are shown in Figure 4. Also shown is a common SRAM signal relationship that will not work for the FM1808. Figure 4. Memory Address Relationships FRAM Signaling CE ...

Page 7

... VDD = 5.5V, /CE at VIH, All inputs at CMOS levels, all outputs unloaded. 5. VIN, VOUT between VDD and VSS. 6. IOL = 4 IOH = -2 July 2000 Ratings - -1.0V to +7.0V 300 C Min Typ Max 4.5 5.0 5 400 -1.0 0.8 2.0 VDD + 1.0 0.4 2.4V FM1808-70 Units Notes 1,6 V 1,7 7/12 ...

Page 8

... Min Units Notes Max Units Notes FM1808-70 -120 Units Notes Max 120 ns 10,000 -120 Units Notes Max 10,000 ...

Page 9

... Input and output timing levels Read Cycle Timing CE A0-17 OE DQ0-7 Write Cycle Timing - /CE Controlled Timing CE A0- DQ0-7 27 July 2000 Equivalent AC Load Circuit 1. FM1808- OHZ 9/12 ...

Page 10

... Data retention is specified The relationship between retention, temperature, and the associated reliability level is characterized in a separate reliability report. 27 July 2000 VDD min Units Notes years 1 FM1808- VDD min t PU 10/12 ...

Page 11

... in. 27 July 2000 Min Nom. Max 2.35 2.65 0.0926 0.1043 0.10 0.30 0.004 0.0118 0.33 0.51 0.013 0.020 0.23 0.32 0.0091 0.0125 17.70 18.10 0.6969 0.7125 7.40 7.60 0.2914 0.2992 1.27 BSC 0.050 BSC 10.00 10.65 0.394 0.419 0.25 0.75 0.010 0.029 .40 1.27 0.016 0.050 0 8 FM1808- . .004 in. 11/12 ...

Page 12

... L in July 2000 D B1 Min Nom. Max 0.250 6.35 0.015 0.39 0.125 0.195 3.18 4.95 0.014 0.022 0.356 0.558 0.030 0.070 0.77 1.77 1.380 1.565 35.1 39.7 0.005 0.13 0.600 0.625 15.24 15.87 0.485 0.580 12.32 14.73 0.100 BSC 2.54 BSC 0.600 BSC 15.24 BSC 0.700 17.78 0.115 0.200 2.93 5.08 FM1808- 12/12 ...

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